Related Questions

In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing
A Remains constant at all speeds
B Is minimum at zero speed and increases monotonically with increase in speed
C Is maximum at zero speed and decreases monotonically with increase in speed
D Becomes minimum at an optimum speed and then increases with further increase in speed
In a partial journal bearing, the angle of contact of the bearing with the journal is
A 120°
B 180°
C 270°
D 360°
In a full journal bearing, the angle of contact of the bearing with the journal is
A 120°
B 180°
C 270°
D 360°
If p = bearing pressure on projected bearing area, Z = absolute viscosity of lubricant and N = speed of journal, then the bearing characteristic number is given by
A $$\frac{{{\text{ZN}}}}{{\text{p}}}$$
B $$\frac{{\text{p}}}{{{\text{ZN}}}}$$
C $$\frac{{\text{Z}}}{{{\text{pN}}}}$$
D $$\frac{{\text{N}}}{{{\text{Zp}}}}$$
When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a
A Short bearing
B Long bearing
C Medium bearing
D Square bearing
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.
A Equal to
B Twice
C Three times
D Four times
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.
A Thick film
B Thin film
C Either A or B
D None of these
When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)
A Is at the maximum distance from CG of the rivet group
B Is at the minimum distance from CG of the rivet group
C Gives the maximum angle between the two forces Fa and Fm
D Gives the minimum angle between the two forces Fa and Fm
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing and R = Radius of bearing surface)
A $$\frac{1}{2}$$μWR
B $$\frac{2}{3}$$μWR
C $$\frac{3}{4}$$μWR
D μWR
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.
A 10 times
B 5 times
C 15 times
D 20 times

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